Assume time t runs from zero to $2\pi$ and that the unit circle has been labled as a clock.
Match each of the pairs of parametric equations with the best description of the curve from the following list. Enter the appropriate letter (A, B, C, D, E, F ) in each blank.

A. Starts at 12 o'clock and moves clockwise one time around.
B. Starts at 6 o'clock and moves clockwise one time around.
C. Starts at 3 o'clock and moves clockwise one time around.
D. Starts at 9 o'clock and moves counterclockwise one time around.
E. Starts at 3 o'clock and moves counterclockwise two times around.
F. Starts at 3 o'clock and moves counterclockwise to 9 o'clock.
1. $\displaystyle x=-\sin(t);$ $\ y = -\cos(t)$
2. $\displaystyle x=-\cos(t);$ $\ y =- \sin(t)$
3. $\displaystyle x=\sin(t);$ $\ y = \cos(t)$
4. $\displaystyle x=\cos{\frac{t}{2}};$ $\ y = \sin{\frac{t}{2}}$
5. $\displaystyle x=\cos(2t);$ $\ y = \sin(2t)$